greybus: loopback: Add asynchronous bi-directional support
A particular ask from the firmware people for some time now has been the ability to drive multiple outstanding bi-directional operations from loopback to loopback Interfaces. This patch implments that change. The approach taken is to make a call to gb_operation_send() and have loopback capture the completion callback itself, with a parallel timer to timeout completion callbacks that take too long. The calling thread will issue each gb_operation_send() as fast as it can within the constraints of thread-safety. In order to support this addition the following new sysfs entries are created on a per-connection basis. - async Zero indicates loopback should use the traditional synchronous model i.e. gb_operation_request_send_sync(). Non-zero indicates loopback should use the new asynchronous model i.e. gb_operation_send() - requests_completed This value indicates the number of requests successfully completed. - requests_timedout This value indicates the number of requests which timed out. - timeout The number of microseconds to give an individual asynchronous request before timing that request out. - timeout_min Read-only attribute informs user-space of the minimum allowed timeout. - timeout_max Read-only attribute informs user-space of the maximum allowed timeout. Note requests_completed + requests_timedout should always equal iteration_max, once iteration_count == iteration_max. Also, at this time we support either synchronous or asynchronous operations in one set of transactions. Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>hifive-unleashed-5.1
Bryan O'Donoghue
Greg Kroah-Hartman
parent
2e238d71ed
commit
12927835d2
|
|
@ -20,6 +20,7 @@
|
|||
#include <linux/debugfs.h>
|
||||
#include <linux/list_sort.h>
|
||||
#include <linux/spinlock.h>
|
||||
#include <linux/workqueue.h>
|
||||
|
||||
#include <asm/div64.h>
|
||||
|
||||
|
|
@ -43,10 +44,24 @@ struct gb_loopback_device {
|
|||
/* We need to take a lock in atomic context */
|
||||
spinlock_t lock;
|
||||
struct list_head list;
|
||||
struct list_head list_op_async;
|
||||
wait_queue_head_t wq;
|
||||
};
|
||||
|
||||
static struct gb_loopback_device gb_dev;
|
||||
|
||||
struct gb_loopback_async_operation {
|
||||
struct gb_loopback *gb;
|
||||
struct gb_operation *operation;
|
||||
struct timeval ts;
|
||||
struct timer_list timer;
|
||||
struct list_head entry;
|
||||
struct work_struct work;
|
||||
struct kref kref;
|
||||
bool pending;
|
||||
int (*completion)(struct gb_loopback_async_operation *op_async);
|
||||
};
|
||||
|
||||
struct gb_loopback {
|
||||
struct gb_connection *connection;
|
||||
|
||||
|
|
@ -66,18 +81,29 @@ struct gb_loopback {
|
|||
struct gb_loopback_stats gpbridge_firmware_latency;
|
||||
|
||||
int type;
|
||||
int async;
|
||||
u32 mask;
|
||||
u32 size;
|
||||
u32 iteration_max;
|
||||
u32 iteration_count;
|
||||
int ms_wait;
|
||||
u32 error;
|
||||
u32 requests_completed;
|
||||
u32 requests_timedout;
|
||||
u32 timeout;
|
||||
u32 jiffy_timeout;
|
||||
u32 timeout_min;
|
||||
u32 timeout_max;
|
||||
u32 lbid;
|
||||
u64 elapsed_nsecs;
|
||||
u32 apbridge_latency_ts;
|
||||
u32 gpbridge_latency_ts;
|
||||
};
|
||||
|
||||
/* Min/max values in jiffies */
|
||||
#define GB_LOOPBACK_TIMEOUT_MIN 1
|
||||
#define GB_LOOPBACK_TIMEOUT_MAX 10000
|
||||
|
||||
#define GB_LOOPBACK_FIFO_DEFAULT 8192
|
||||
|
||||
static unsigned kfifo_depth = GB_LOOPBACK_FIFO_DEFAULT;
|
||||
|
|
@ -215,6 +241,8 @@ static void gb_loopback_check_attr(struct gb_loopback *gb,
|
|||
gb->ms_wait = GB_LOOPBACK_MS_WAIT_MAX;
|
||||
if (gb->size > gb_dev.size_max)
|
||||
gb->size = gb_dev.size_max;
|
||||
gb->requests_timedout = 0;
|
||||
gb->requests_completed = 0;
|
||||
gb->iteration_count = 0;
|
||||
gb->error = 0;
|
||||
|
||||
|
|
@ -230,6 +258,11 @@ static void gb_loopback_check_attr(struct gb_loopback *gb,
|
|||
case GB_LOOPBACK_TYPE_PING:
|
||||
case GB_LOOPBACK_TYPE_TRANSFER:
|
||||
case GB_LOOPBACK_TYPE_SINK:
|
||||
gb->jiffy_timeout = usecs_to_jiffies(gb->timeout);
|
||||
if (!gb->jiffy_timeout)
|
||||
gb->jiffy_timeout = GB_LOOPBACK_TIMEOUT_MIN;
|
||||
else if (gb->jiffy_timeout > GB_LOOPBACK_TIMEOUT_MAX)
|
||||
gb->jiffy_timeout = GB_LOOPBACK_TIMEOUT_MAX;
|
||||
gb_loopback_reset_stats(gb);
|
||||
wake_up(&gb->wq);
|
||||
break;
|
||||
|
|
@ -252,6 +285,14 @@ gb_loopback_stats_attrs(gpbridge_firmware_latency);
|
|||
|
||||
/* Number of errors encountered during loop */
|
||||
gb_loopback_ro_attr(error);
|
||||
/* Number of requests successfully completed async */
|
||||
gb_loopback_ro_attr(requests_completed);
|
||||
/* Number of requests timed out async */
|
||||
gb_loopback_ro_attr(requests_timedout);
|
||||
/* Timeout minimum in useconds */
|
||||
gb_loopback_ro_attr(timeout_min);
|
||||
/* Timeout minimum in useconds */
|
||||
gb_loopback_ro_attr(timeout_max);
|
||||
|
||||
/*
|
||||
* Type of loopback message to send based on protocol type definitions
|
||||
|
|
@ -270,8 +311,12 @@ gb_dev_loopback_rw_attr(ms_wait, d);
|
|||
gb_dev_loopback_rw_attr(iteration_max, u);
|
||||
/* The current index of the for (i = 0; i < iteration_max; i++) loop */
|
||||
gb_dev_loopback_ro_attr(iteration_count, false);
|
||||
/* A bit-mask of destination connecitons to include in the test run */
|
||||
/* A bit-mask of destination connections to include in the test run */
|
||||
gb_dev_loopback_rw_attr(mask, u);
|
||||
/* A flag to indicate synchronous or asynchronous operations */
|
||||
gb_dev_loopback_rw_attr(async, u);
|
||||
/* Timeout of an individual asynchronous request */
|
||||
gb_dev_loopback_rw_attr(timeout, u);
|
||||
|
||||
static struct attribute *loopback_attrs[] = {
|
||||
&dev_attr_latency_min.attr,
|
||||
|
|
@ -295,11 +340,19 @@ static struct attribute *loopback_attrs[] = {
|
|||
&dev_attr_iteration_count.attr,
|
||||
&dev_attr_iteration_max.attr,
|
||||
&dev_attr_mask.attr,
|
||||
&dev_attr_async.attr,
|
||||
&dev_attr_error.attr,
|
||||
&dev_attr_requests_completed.attr,
|
||||
&dev_attr_requests_timedout.attr,
|
||||
&dev_attr_timeout.attr,
|
||||
&dev_attr_timeout_min.attr,
|
||||
&dev_attr_timeout_max.attr,
|
||||
NULL,
|
||||
};
|
||||
ATTRIBUTE_GROUPS(loopback);
|
||||
|
||||
static void gb_loopback_calculate_stats(struct gb_loopback *gb);
|
||||
|
||||
static u32 gb_loopback_nsec_to_usec_latency(u64 elapsed_nsecs)
|
||||
{
|
||||
u32 lat;
|
||||
|
|
@ -381,7 +434,200 @@ error:
|
|||
return ret;
|
||||
}
|
||||
|
||||
static int gb_loopback_sink(struct gb_loopback *gb, u32 len)
|
||||
static void __gb_loopback_async_operation_destroy(struct kref *kref)
|
||||
{
|
||||
struct gb_loopback_async_operation *op_async;
|
||||
|
||||
op_async = container_of(kref, struct gb_loopback_async_operation, kref);
|
||||
|
||||
list_del(&op_async->entry);
|
||||
if (op_async->operation)
|
||||
gb_operation_put(op_async->operation);
|
||||
kfree(op_async);
|
||||
}
|
||||
|
||||
static void gb_loopback_async_operation_get(struct gb_loopback_async_operation
|
||||
*op_async)
|
||||
{
|
||||
kref_get(&op_async->kref);
|
||||
}
|
||||
|
||||
static void gb_loopback_async_operation_put(struct gb_loopback_async_operation
|
||||
*op_async)
|
||||
{
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&gb_dev.lock, flags);
|
||||
kref_put(&op_async->kref, __gb_loopback_async_operation_destroy);
|
||||
spin_unlock_irqrestore(&gb_dev.lock, flags);
|
||||
}
|
||||
|
||||
static struct gb_loopback_async_operation *
|
||||
gb_loopback_operation_find(u16 id)
|
||||
{
|
||||
struct gb_loopback_async_operation *op_async;
|
||||
bool found = false;
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&gb_dev.lock, flags);
|
||||
list_for_each_entry(op_async, &gb_dev.list_op_async, entry) {
|
||||
if (op_async->operation->id == id) {
|
||||
gb_loopback_async_operation_get(op_async);
|
||||
found = true;
|
||||
break;
|
||||
}
|
||||
}
|
||||
spin_unlock_irqrestore(&gb_dev.lock, flags);
|
||||
|
||||
return found ? op_async : NULL;
|
||||
}
|
||||
|
||||
static void gb_loopback_async_operation_callback(struct gb_operation *operation)
|
||||
{
|
||||
struct gb_loopback_async_operation *op_async;
|
||||
struct gb_loopback *gb;
|
||||
struct timeval te;
|
||||
bool err = false;
|
||||
|
||||
do_gettimeofday(&te);
|
||||
op_async = gb_loopback_operation_find(operation->id);
|
||||
if (!op_async)
|
||||
return;
|
||||
|
||||
gb = op_async->gb;
|
||||
mutex_lock(&gb->mutex);
|
||||
|
||||
if (!op_async->pending || gb_operation_result(operation)) {
|
||||
err = true;
|
||||
} else {
|
||||
if (op_async->completion)
|
||||
if (op_async->completion(op_async))
|
||||
err = true;
|
||||
}
|
||||
|
||||
if (err) {
|
||||
gb->error++;
|
||||
} else {
|
||||
gb->requests_completed++;
|
||||
gb_loopback_push_latency_ts(gb, &op_async->ts, &te);
|
||||
gb->elapsed_nsecs = gb_loopback_calc_latency(&op_async->ts,
|
||||
&te);
|
||||
gb_loopback_calculate_stats(gb);
|
||||
}
|
||||
|
||||
if (op_async->pending) {
|
||||
gb->iteration_count++;
|
||||
op_async->pending = false;
|
||||
del_timer_sync(&op_async->timer);
|
||||
gb_loopback_async_operation_put(op_async);
|
||||
}
|
||||
mutex_unlock(&gb->mutex);
|
||||
|
||||
dev_dbg(&gb->connection->bundle->dev, "complete operation %d\n",
|
||||
operation->id);
|
||||
|
||||
gb_loopback_async_operation_put(op_async);
|
||||
}
|
||||
|
||||
static void gb_loopback_async_operation_work(struct work_struct *work)
|
||||
{
|
||||
struct gb_loopback *gb;
|
||||
struct gb_operation *operation;
|
||||
struct gb_loopback_async_operation *op_async;
|
||||
|
||||
op_async = container_of(work, struct gb_loopback_async_operation, work);
|
||||
if (!op_async)
|
||||
return;
|
||||
|
||||
gb = op_async->gb;
|
||||
operation = op_async->operation;
|
||||
|
||||
mutex_lock(&gb->mutex);
|
||||
if (op_async->pending) {
|
||||
gb->requests_timedout++;
|
||||
gb->error++;
|
||||
gb->iteration_count++;
|
||||
op_async->pending = false;
|
||||
gb_loopback_async_operation_put(op_async);
|
||||
}
|
||||
mutex_unlock(&gb->mutex);
|
||||
|
||||
dev_dbg(&gb->connection->bundle->dev, "timeout operation %d\n",
|
||||
operation->id);
|
||||
|
||||
gb_operation_cancel(operation, -ETIMEDOUT);
|
||||
gb_loopback_async_operation_put(op_async);
|
||||
}
|
||||
|
||||
static void gb_loopback_async_operation_timeout(unsigned long data)
|
||||
{
|
||||
struct gb_loopback_async_operation *op_async;
|
||||
u16 id = data;
|
||||
|
||||
op_async = gb_loopback_operation_find(id);
|
||||
if (!op_async) {
|
||||
pr_err("operation %d not found - time out ?\n", id);
|
||||
return;
|
||||
}
|
||||
schedule_work(&op_async->work);
|
||||
}
|
||||
|
||||
static int gb_loopback_async_operation(struct gb_loopback *gb, int type,
|
||||
void *request, int request_size,
|
||||
int response_size,
|
||||
void *completion)
|
||||
{
|
||||
struct gb_loopback_async_operation *op_async;
|
||||
struct gb_operation *operation;
|
||||
int ret;
|
||||
unsigned long flags;
|
||||
|
||||
op_async = kzalloc(sizeof(*op_async), GFP_KERNEL);
|
||||
if (!op_async)
|
||||
return -ENOMEM;
|
||||
|
||||
INIT_WORK(&op_async->work, gb_loopback_async_operation_work);
|
||||
init_timer(&op_async->timer);
|
||||
kref_init(&op_async->kref);
|
||||
|
||||
operation = gb_operation_create(gb->connection, type, request_size,
|
||||
response_size, GFP_KERNEL);
|
||||
if (!operation) {
|
||||
ret = -ENOMEM;
|
||||
goto error;
|
||||
}
|
||||
|
||||
if (request_size)
|
||||
memcpy(operation->request->payload, request, request_size);
|
||||
|
||||
op_async->gb = gb;
|
||||
op_async->operation = operation;
|
||||
op_async->completion = completion;
|
||||
|
||||
spin_lock_irqsave(&gb_dev.lock, flags);
|
||||
list_add_tail(&op_async->entry, &gb_dev.list_op_async);
|
||||
spin_unlock_irqrestore(&gb_dev.lock, flags);
|
||||
|
||||
do_gettimeofday(&op_async->ts);
|
||||
op_async->pending = true;
|
||||
ret = gb_operation_request_send(operation,
|
||||
gb_loopback_async_operation_callback,
|
||||
GFP_KERNEL);
|
||||
if (ret)
|
||||
goto error;
|
||||
|
||||
op_async->timer.function = gb_loopback_async_operation_timeout;
|
||||
op_async->timer.expires = jiffies + gb->jiffy_timeout;
|
||||
op_async->timer.data = (unsigned long)operation->id;
|
||||
add_timer(&op_async->timer);
|
||||
|
||||
return ret;
|
||||
error:
|
||||
gb_loopback_async_operation_put(op_async);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int gb_loopback_sync_sink(struct gb_loopback *gb, u32 len)
|
||||
{
|
||||
struct gb_loopback_transfer_request *request;
|
||||
int retval;
|
||||
|
|
@ -398,7 +644,7 @@ static int gb_loopback_sink(struct gb_loopback *gb, u32 len)
|
|||
return retval;
|
||||
}
|
||||
|
||||
static int gb_loopback_transfer(struct gb_loopback *gb, u32 len)
|
||||
static int gb_loopback_sync_transfer(struct gb_loopback *gb, u32 len)
|
||||
{
|
||||
struct gb_loopback_transfer_request *request;
|
||||
struct gb_loopback_transfer_response *response;
|
||||
|
|
@ -440,12 +686,91 @@ gb_error:
|
|||
return retval;
|
||||
}
|
||||
|
||||
static int gb_loopback_ping(struct gb_loopback *gb)
|
||||
static int gb_loopback_sync_ping(struct gb_loopback *gb)
|
||||
{
|
||||
return gb_loopback_operation_sync(gb, GB_LOOPBACK_TYPE_PING,
|
||||
NULL, 0, NULL, 0);
|
||||
}
|
||||
|
||||
static int gb_loopback_async_sink(struct gb_loopback *gb, u32 len)
|
||||
{
|
||||
struct gb_loopback_transfer_request *request;
|
||||
int retval;
|
||||
|
||||
request = kmalloc(len + sizeof(*request), GFP_KERNEL);
|
||||
if (!request)
|
||||
return -ENOMEM;
|
||||
|
||||
request->len = cpu_to_le32(len);
|
||||
retval = gb_loopback_async_operation(gb, GB_LOOPBACK_TYPE_SINK,
|
||||
request, len + sizeof(*request),
|
||||
0, NULL);
|
||||
kfree(request);
|
||||
return retval;
|
||||
}
|
||||
|
||||
static int gb_loopback_async_transfer_complete(
|
||||
struct gb_loopback_async_operation *op_async)
|
||||
{
|
||||
struct gb_loopback *gb;
|
||||
struct gb_operation *operation;
|
||||
struct gb_loopback_transfer_request *request;
|
||||
struct gb_loopback_transfer_response *response;
|
||||
size_t len;
|
||||
int retval = 0;
|
||||
|
||||
gb = op_async->gb;
|
||||
operation = op_async->operation;
|
||||
request = operation->request->payload;
|
||||
response = operation->response->payload;
|
||||
len = le32_to_cpu(request->len);
|
||||
|
||||
if (memcmp(request->data, response->data, len)) {
|
||||
dev_err(&gb->connection->bundle->dev,
|
||||
"Loopback Data doesn't match operation id %d\n",
|
||||
operation->id);
|
||||
retval = -EREMOTEIO;
|
||||
} else {
|
||||
gb->apbridge_latency_ts =
|
||||
(u32)__le32_to_cpu(response->reserved0);
|
||||
gb->gpbridge_latency_ts =
|
||||
(u32)__le32_to_cpu(response->reserved1);
|
||||
}
|
||||
|
||||
return retval;
|
||||
}
|
||||
|
||||
static int gb_loopback_async_transfer(struct gb_loopback *gb, u32 len)
|
||||
{
|
||||
struct gb_loopback_transfer_request *request;
|
||||
int retval, response_len;
|
||||
|
||||
request = kmalloc(len + sizeof(*request), GFP_KERNEL);
|
||||
if (!request)
|
||||
return -ENOMEM;
|
||||
|
||||
memset(request->data, 0x5A, len);
|
||||
|
||||
request->len = cpu_to_le32(len);
|
||||
response_len = sizeof(struct gb_loopback_transfer_response);
|
||||
retval = gb_loopback_async_operation(gb, GB_LOOPBACK_TYPE_TRANSFER,
|
||||
request, len + sizeof(*request),
|
||||
len + response_len,
|
||||
gb_loopback_async_transfer_complete);
|
||||
if (retval)
|
||||
goto gb_error;
|
||||
|
||||
gb_error:
|
||||
kfree(request);
|
||||
return retval;
|
||||
}
|
||||
|
||||
static int gb_loopback_async_ping(struct gb_loopback *gb)
|
||||
{
|
||||
return gb_loopback_async_operation(gb, GB_LOOPBACK_TYPE_PING,
|
||||
NULL, 0, 0, NULL);
|
||||
}
|
||||
|
||||
static int gb_loopback_request_recv(u8 type, struct gb_operation *operation)
|
||||
{
|
||||
struct gb_connection *connection = operation->connection;
|
||||
|
|
@ -512,6 +837,10 @@ static void gb_loopback_reset_stats(struct gb_loopback *gb)
|
|||
memcpy(&gb->gpbridge_firmware_latency, &reset,
|
||||
sizeof(struct gb_loopback_stats));
|
||||
|
||||
/* Set values to report min/max timeout to user-space */
|
||||
gb->timeout_min = jiffies_to_usecs(GB_LOOPBACK_TIMEOUT_MIN);
|
||||
gb->timeout_max = jiffies_to_usecs(GB_LOOPBACK_TIMEOUT_MAX);
|
||||
|
||||
/* Reset aggregate stats */
|
||||
memcpy(&gb->latency, &reset, sizeof(struct gb_loopback_stats));
|
||||
memcpy(&gb->throughput, &reset, sizeof(struct gb_loopback_stats));
|
||||
|
|
@ -599,23 +928,25 @@ static int gb_loopback_fn(void *data)
|
|||
int ms_wait = 0;
|
||||
int type;
|
||||
u32 size;
|
||||
u32 send_count = 0;
|
||||
struct gb_loopback *gb = data;
|
||||
|
||||
while (1) {
|
||||
if (!gb->type)
|
||||
wait_event_interruptible(gb->wq, gb->type ||
|
||||
kthread_should_stop());
|
||||
|
||||
if (kthread_should_stop())
|
||||
break;
|
||||
|
||||
mutex_lock(&gb->mutex);
|
||||
|
||||
sysfs_notify(&gb->connection->bundle->dev.kobj,
|
||||
NULL, "iteration_count");
|
||||
|
||||
/* Optionally terminate */
|
||||
if (gb->iteration_count == gb->iteration_max) {
|
||||
if (send_count == gb->iteration_max) {
|
||||
gb->type = 0;
|
||||
send_count = 0;
|
||||
mutex_unlock(&gb->mutex);
|
||||
continue;
|
||||
}
|
||||
|
|
@ -625,19 +956,33 @@ static int gb_loopback_fn(void *data)
|
|||
mutex_unlock(&gb->mutex);
|
||||
|
||||
/* Else operations to perform */
|
||||
if (type == GB_LOOPBACK_TYPE_PING)
|
||||
error = gb_loopback_ping(gb);
|
||||
else if (type == GB_LOOPBACK_TYPE_TRANSFER)
|
||||
error = gb_loopback_transfer(gb, size);
|
||||
else if (type == GB_LOOPBACK_TYPE_SINK)
|
||||
error = gb_loopback_sink(gb, size);
|
||||
if (gb->async) {
|
||||
if (type == GB_LOOPBACK_TYPE_PING) {
|
||||
error = gb_loopback_async_ping(gb);
|
||||
gb_loopback_calculate_stats(gb);
|
||||
} else if (type == GB_LOOPBACK_TYPE_TRANSFER) {
|
||||
error = gb_loopback_async_transfer(gb, size);
|
||||
} else if (type == GB_LOOPBACK_TYPE_SINK) {
|
||||
error = gb_loopback_async_sink(gb, size);
|
||||
}
|
||||
|
||||
if (error)
|
||||
gb->error++;
|
||||
|
||||
gb_loopback_calculate_stats(gb);
|
||||
gb->iteration_count++;
|
||||
if (error)
|
||||
gb->error++;
|
||||
} else {
|
||||
/* We are effectively single threaded here */
|
||||
if (type == GB_LOOPBACK_TYPE_PING)
|
||||
error = gb_loopback_sync_ping(gb);
|
||||
else if (type == GB_LOOPBACK_TYPE_TRANSFER)
|
||||
error = gb_loopback_sync_transfer(gb, size);
|
||||
else if (type == GB_LOOPBACK_TYPE_SINK)
|
||||
error = gb_loopback_sync_sink(gb, size);
|
||||
|
||||
if (error)
|
||||
gb->error++;
|
||||
gb->iteration_count++;
|
||||
gb_loopback_calculate_stats(gb);
|
||||
}
|
||||
send_count++;
|
||||
if (ms_wait)
|
||||
msleep(ms_wait);
|
||||
}
|
||||
|
|
@ -742,6 +1087,10 @@ static int gb_loopback_connection_init(struct gb_connection *connection)
|
|||
init_waitqueue_head(&gb->wq);
|
||||
gb_loopback_reset_stats(gb);
|
||||
|
||||
/* Reported values to user-space for min/max timeouts */
|
||||
gb->timeout_min = jiffies_to_usecs(GB_LOOPBACK_TIMEOUT_MIN);
|
||||
gb->timeout_max = jiffies_to_usecs(GB_LOOPBACK_TIMEOUT_MAX);
|
||||
|
||||
if (!gb_dev.count) {
|
||||
/* Calculate maximum payload */
|
||||
gb_dev.size_max = gb_operation_get_payload_size_max(connection);
|
||||
|
|
@ -847,6 +1196,7 @@ static int loopback_init(void)
|
|||
int retval;
|
||||
|
||||
INIT_LIST_HEAD(&gb_dev.list);
|
||||
INIT_LIST_HEAD(&gb_dev.list_op_async);
|
||||
spin_lock_init(&gb_dev.lock);
|
||||
gb_dev.root = debugfs_create_dir("gb_loopback", NULL);
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue